[PATCH 5.10 302/406] crypto: stm32 - fix loop iterating through scatterlist for DMA

Greg Kroah-Hartman
2023-09-17T19:37:32Z

From: Thomas Bourgoin <thomas.bourgoin@foss.st.com>

commit d9c83f71eeceed2cb54bb78be84f2d4055fd9a1f upstream.

We were reading the length of the scatterlist sg after copying value of
tsg inside.
So we are using the size of the previous scatterlist and for the first
one we are using an unitialised value.
Fix this by copying tsg in sg[0] before reading the size.

Fixes : 8a1012d3f2ab ("crypto: stm32 - Support for STM32 HASH module")
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Bourgoin <thomas.bourgoin@foss.st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/crypto/stm32/stm32-hash.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/crypto/stm32/stm32-hash.c
+++ b/drivers/crypto/stm32/stm32-hash.c
@@ -564,9 +564,9 @@ static int stm32_hash_dma_send(struct st
}

for_each_sg(rctx->sg, tsg, rctx->nents, i) {
+ sg[0] = *tsg;
len = sg->length;

- sg[0] = *tsg;
if (sg_is_last(sg)) {
if (hdev->dma_mode == 1) {
len = (ALIGN(sg->length, 16) - 16);